Wilhelm schmidt



No. a|5,3u. P-atelited 0%.. 5; I898.

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COMPOUND ENGINE WITH REGULATOR FDR SUPERHEA'TEDSTEAM.

(Apglication filed Mar. 30, 1 897.)

(No Modal.)

Tm: mums PETERS co, PHOTQLITHOV wnsr-vmmom a. c.

S vember 27, 1896,) of which the following is an UNITED STATES PATENTOFFICE.

WILI-IELM SCHMIDT, OF BALLENSTADT, GERMANY.

COMPOUND ENGINE WITH REGULATOR FOR SUPERHEATED STEAM.

SPECIFICATION forming part of Letters Patent No. 615,311, dated December6, 1898.

Application filed March 30,1 8 9 7.

To all whom, it may concern.-

Be it known that I, WILHELM SCHMIDT, a subject of the King of Prussia,German Emperor, and a resident of Ballenstadt-on-the I-Iarz, in theDuchy of Anhalt, in the German Empire, have invented certain new anduseful Improvements in Compound Engines with Regulator for SuperheatedSteam, (for which patents have been obtained in Switzerland, No. 12,584,dated June 3, 1896; in France, No. 257,458, dated June 22, 1896; inBelgium, No. 122,307, dated July 2, 1896; in Italy, No. 32 1, Vol.LXXXII, dated July 6,

'1896; in Hungary, No. 7, 115, dated July 8,

1896, and in Canada, No. 54,185, dated Noexact specification.

This invention forms animprovement on the arrangement described in myapplication, Serial No. 599,549, filed July 17, 1896, in which asteam-power plant adapted to Work with su-, perheated steam is combinedwith a device for regulating the temperature, (especially the inlettemperature,) of the superheated steam, according to the degree offilling of the cylinder of the engine of that plant. Said regulatingdevice is therefore such a one the adjustment of which may be determinedaften or made dependent on the degree of filling of the cylinder. Theobject of the arrangement described in said application consists, first,in obtaining a practically perfeet exhaustion of the theoretical energyof the superheated steam, and, second, in allow ing of the use ofeven'highly-superheated steam without any detriment to the respectivecylinder and the piston of the same. The points to be considered withregard to these purposes and advantages are fully treated in the priorapplication in question, and I therefore limit myself in the presentapplication to dwelling upon those points only that are of specialimportance for the subject-matter hereinafter described. The regulationof the initial temperature of the superheated steam is also in this case(just so as in the application, Serial No. 599,549, filed July 17,1896)to be effected in such a way that the greatest part of work that can berendered at a stroke of the piston is rendered by dry steam, Where-Serial No, 629,981. (No model.)

as the rest of work is rendered by expanding saturated steam in such amanner that the expanding superheated steam remains dry up to about halfthe way of the piston. In other words, the regulation is to be such aone that on a decrease of the degree of filling of the cylinder anincrease in the inlet temperature of the superheated steam is produced,and reversely, in either case with such a result that the greatest partof work which (with regard to the relative dimensions or proportions ofthe respective cylinder) can be admitted to be rendered by dry steam isobtained at any degree of filling of the cylinder, so that that part ofthe stroke on which the expanding steam remains dry may be of a uniformlength in spite of changes in the degree of filling of the respectivecylinder. To obtain this result, the inlet temperature of thesuperheated steam should thus be made dependent on or or steam,preferably, however, to the latter.

Now the present invention refers in general to quite a particular.mauner of that transfer of heat, this particular mannerbeing intendedfor compound engines or multiple-expansion engines, respectively, andconsisting in trans- 8 5 ferring the heat removed from the superheatedlive steam to the expanded steam contained within or passingthrough thereceiver of the respective engine. This steam is thus to be heated orreheated by superheated live steam. I have found it advantageous to letthe superheated live steam have such a temperature that its excess ofheat (with regard to the degree of filling of the high-pressure cylinderof the engine) is great enough to heat 5 the receiver-steam up to such adegree that (with regard to the degree of filling of the low-pressurecylinder) there occurswit-hin this cylinder a similar course in the workof the steam as is the case with the live steam I00 passes through thatreheater on its way from.

the generator to the high-pressure cylinder.

Letting the whole of the superheated live steam pass through thereheater of the rethe hi gh-pressurecylinder, as'well as the lowpressure cylinder, may be attained and maintained when thethrottle-valve is fully open, so that the greatest part of thesuperheated steam passes directly through the casing m into thehigh'pressure cylinder L, while but a small part flows to said cylinderon the byway through the pipes 0, M, and so. When the degree of fillingis increased, there takes ceiver is to be preferred if the degree offilling of the cylinder of the respective engine is a constant one,whereas with engines with changing degrees of filling it is moreadvantageous to lead but a part of that steam through the reheater inquestion, the quantity of that part being of course dependent on thedegree of filling.

An arrangement adapted to work in the manner last mentioned is shown invertical section in the accompanying drawing.

The highly-superheated steam enters first a casing m, that contains athrottle-valve n. The latter may be adjusted or regulated either by handor from the regulator or link-motion or steam-distributer of the engineor from any movable part, the extent of motion of which depends on thatof any of the parts just mentioned. A pipe 0 branches from the casing mabove the valve 02. Said pipe terminates in a lower chamber 19 of thereceiver 19 p. The right-hand side of the receiver is connected with theoutlet-pipe r of the highpressure cylinder L and the left-hand side ofthe receiver is connected with the low-pressure cylinder L' by the pipe8. The lower portion of the receiver is separated from the other or mainportion by a horizontal wall or plate w, that supports a number ofupright pipes M of U-like shape. The legs on the left-hand side areseparated from those on the righthand side by means of the wall t, andthe steam passing from the pipe 7" to the pipe 8 is therefore compelledto wash the pipes M on the whole of their length. The right-hand lowerchamber 19 of the receiver is connected with the casing m by a pipe m,terminating in said casing below the valve n. The chambers p and p areput into intercommunication by an aperture t, allowing of the water ofcondensation collecting within the chamber p to fiow into and throughthe chamber 19 There is not constantly a formation of water ofcondensation, but only on the commencement of'work. \Vhen the apertureis not fully closed by the water of condensation, then of course a smallquantity of steam will pass through the aperture from p to 19 Owing,however, to the small size of that aperture the quantity of steampassing through the same is so little that a change in the effeet withregard to the object in View is not caused thereby.

The combined surfaces of the pipes M are so measured that the initialtemperature as required for the lowest degree of filling for place acorresponding reduction of the free section of the casing m bya suitableturning of the valve n, and a greater part of the superheated steam istherefore caused to pass through the pipes o, M, and 00. In either ofthese cases the respective excess of temperature of the superheatedsteam is transmitted to the steam present within or flowing through thereceiver 19 p, and that heat is utilized within the low-pressurecylinder L according to the idea of invention.

Having thus fully described the nature of this invention, what I desireto secure by Letters Patent of the United States is- 1. In a compoundengine, the combination with the high and low pressure cylinder, thereceiver and the parts between the latter and said cylinders, of areheater combined with said receiver, said reheater being connected onthe one side to the live-steam conduit of the engine, and at the otherside to the highpressure cylinder L, of the same, the receiverspaceproper being connected atone side with the exhaust-steam pipe 1 of saidhigh-pressure cylinder L and at the other side with the steam-inlet pipe5 of the low-pressure cylinder L, for the purpose as described.

2. In a compound engine, the combination with the high and low pressurecylinder, the receiver and the parts between the latter and saidcylinders, of a reheater combined with said receiver, said reheaterbeing connected on the one side to the live-steam conduit of the engine,and at the other side to the highpressure cylinder L of the same, thereceiverspace proper being connected at one side with the exhaust-steampipe 1' of said high-pressure cylinder L and at the other side with thesteam-inlet pipe 8 of the low-pressure cylinder L, a direct connectionbetween the said live-steam conduit and the high-pressure cylinder, forthe purpose as described.

3. In a compound engine, the combination with the high and low pressurecylinder, the receiver and the parts between the latter, and saidcylinders,.of a reheater combined with saidreceiver, said reheater beingconnected on the one side to the live-steam conduit of the engine, andat the other side to the highpressure cylinder of the same, the livesteam being caused to a greater or less extent, according to theposition of the throttle-valve n, partly to pass directly through thecasing 911,, and partly through 0 M 00 to the said highpressurecylinder, the receiver-space proper being connected at one side with theexhauststeam pipe 1" of the high-pressure cylinder L, Q In testimonywhereof I have signed this and at the other side with the steam-inletspecification in the presence of two subscribpipe 8 of the low-pressurecylinder L, a diing Witnesses.

rect connection between the said live-steam \VILHELM SCHMIDT. 5 conduitand the high-pressure cylinder of the Vitnesses:

engine, and a regulating device in said direct R. HERPICH,

connection, for the purpose as described. I C. BROOKHAUS.

